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refactor(rome_formatter): Comments #3227
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MichaReiser
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Comparing refactor(rome_formatter): Comments Snapshot #14 to median since last deploy of rome.tools.
1 page tested
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| Chrome Desktop | iPhone, 4G LTE | Motorola Moto G Power, 3G connection |
|---|---|---|
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Most significant changes
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Value | Budget |
|---|---|---|
| Total JavaScript Size in Bytes Chrome Desktop |
1.24 MB  from 86.8 KB |
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| Total JavaScript Size in Bytes iPhone, 4G LTE |
1.24 MB from 86.8 KB |
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| Total JavaScript Size in Bytes Motorola Moto G Power, 3G connection |
1.24 MB from 86.8 KB |
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| Cumulative Layout Shift Chrome Desktop |
0.049  from 0.006 |
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| Number of Requests Chrome Desktop |
39  from 5 |
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5 other significant changes: Number of Requests on iPhone, 4G LTE, Number of Requests on Motorola Moto G Power, 3G connection, Total Page Size in Bytes on Chrome Desktop, Total Page Size in Bytes on iPhone, 4G LTE, Total Page Size in Bytes on Motorola Moto G Power, 3G connection
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Parser conformance results on ubuntu-latestjs/262
jsx/babel
symbols/microsoft
ts/babel
ts/microsoft
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!bench_formatter |
Formatter Benchmark Results |
This PR removes the `FormatElement::Comment` element. It was used to this point because the `group` builder had to move `comments` outside of the start/end of the group. No such inspection is necessary after the refactor which is why the element can be deleted.
This PR moves the logic for formatting a node as `verbatim` to `rome_formatter` as it isn't JS specific
Comments Formatter integration
Co-authored-by: l3ops <[email protected]>
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!bench_formatter |
Formatter Benchmark Results |
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Summary
This PR is empty for now but I want to use it to merge all comment-related PRs into it as the individual PRs may not compile on their own.
I split the whole refactory mainly on file boundaries to avoid having to deal with many merge conflicts between the different PRs. However, this means, that individual PRs won't compile nor will tests be passing.
This is what this PR is for. It ensures that all changes compile together and that there are no regressing tests. The main motivation of splitting this PR into multiple smaller PRs is to ease reviewing.
FormatElement::Comment#3240rome_formatter#3241Functionality
JSX Suppressions
It's now possible to suppress formatting of a JSX element or fragment by using
Fix instability issues
Fixes #2768
Formatting order
The comment formatting relied on the fact that tokens (and thus nodes) are formatted in the order they get written to the final document to be able to decide whether to insert a space before/after a comment. However, there is no enforcement of this constraint and ignoring it leads to very subtle spacing bugs that are hard to notice and track down. There are even situations where it's surprisingly hard, if not even impossible, to format the document in order if it is necessary to test if some other element will break that only gets written later.
This PR removes the constraint that tokens must be formatted in order (they still must be written in the correct order to the output buffer).
Performance
The overall performance is improving. The reasons for this are
FormatState. TheFormatStatesnapshot has a size of zero now, significantly reducing the cost of formatting statements.GroupElementsBufferadded a level of indirection to everywrite,state,contextetc. calls. It also required to use a Boxed buffer snapshot to store itsemptyflagFxHashMaps are fast :)Test Plan
cargo test